Saw-sharpening machine



(No Model.) 2 Sheets--Shee'J 1.

M. COVEL. SAW SHVARPENING MACHlNE. N0. 319,794. Patented June 9, 1885.

I lfm/wr Qlo N. PETERS. PMlErLRhagnphnr, Wldhtun. DC.

Wnes 6151 (No Model.) 2 Sheets-Sheet 2.

M. OOVEL.

SAW SHARPENING MACHINE.

No. 319,794. PatentedJune 9, 1885. A'

I To all whom it may concern;

AUnire Srarns agrar erica.

MILo covnL, or CHICAGO, ILLINOIS.-

` SAW-SHARPENING'MACHINE.

encre-acarrear forming para of Letters Patent Irc. 319,794, Meerane 9, 1885.

Application tiled December G, 1883. (No model.)

v Be itknown that I, MILo CovEL, of Chicago, county of Cook and State of illinois, have invented certain new'and useful Improvements in Saw-Sharpening Machines, of which thefollowing is a full, clear, and exact description,

'that will enable'v others to make and use the same, reference being had to the accompany ing drawings, forming a part of this specification.

This invention relates to improvements in that class of saw-sharpening machines 'set forth in my Letters PatentNo. 215,267, and Reissue No. 10,099. f

The nature of this invention consists in the construction and arrangement of -the mechan; ism for transmitting motion to the emerywheel and feed'finger, and in means foradjustmcnt relative to different-sized teeth, and also for clamping the saw in position during the operation of sharpening the same, as will be hereinafter more fully set forth in detail.

Figure l is a front elevation of a machine embodying` my improved features, and Fig. 2 a detachedfdetail, Fig. 3,' a detached sectional detail. Fig. 4 isa side elevation. Y

Referring to the drawings,'A reprcsentsthe supporting frame`-work,'and A Aztwo verti@ eal shafts, and A3 a horizontal shaft, which are lconnected together by means of beveled gear-wheels, as shown, and put in motion by means of the hand-crank A, for the purpose of raising and lowering the saw; but as this mechanism presents no new or novel features a detailed description will therefore be omitted.

The irregular-shaped cam B is mounted and rotates upon the front end of the shaft A5, and performs the dual functions of imparting the required reciprocating movement toboth the emery-wheel B and the feed-finger orpush` pawl B2. A beveled gear-wheeLA, is mounted 011 the rear end ofthe shaft A5, which is adapted to engage with a compa-nien gear-j wheel, A7, placed at right angles thereto, and mounted on the shaft AS. Thelatter shaft has also mounted thereon the bandpulley A9, which receives and transmits the required mo, tion from the motive power to the parts above described.

The outer end ofthe lever B is pivoted the bracket a, which is in turn attached to a part of the framework. To the inner'end lof this lever is attached the upper end of the connecting-rod Bf and the friction roller a2, placed a little back from the end of the rod B4, as shown in Fig; l. This roller is adapted to have a rolling contact with the irregular cam B, for the purpose of imparting the required reciprocating movement to the lever B3.

The lower end of the connecting-rod B4 is attached to one end of the graduated arm C,

the opposite end of said arm being pivoted to the supporting frame-work at a3. This arm is provided with a number of perforations,a"3 arranged at regular intervals, for the purpose of adjusting thelower end of the conneetionwith the emery-wheel gate to as many different po sitions as there are holes in the arm C. By shifting the lower end of the rod B5 from one hole to another in the arm C the emery-wheel is adjusted for different saws, in accordance with the required depth of the teeth. For instance, suppose hole No. 2 to be the adjustment for a tooth one-half of an inch in depth; No. 3, three-fourths of an inch in depth, and so on, eachhew position or distance between each hole representing one-.fourth of an inch inthe depth of the tooth. The holes in the arm C run from two' to eight, in order to dress teeth from one-half inch to two inches, advancing onefonrth of an inch in regular order, all ofthe teeth being of the same shape, which' is ofcourse due to the irregular Vearn B, which imparts the same form to all the teeth alike, 4irrespective ofthe diameter of the saw vor the depth of the j teeth. By this arrangement the adjustment is always exact and positive, which would not be the case were the arm C. provided with a rectangular slot instead of the series of numbered apertures. A great deal of time -isalso saved where a number of saws of different sizes'are dressed on the same machine, as the roi' may be adj usted to by the lockiugmut b2. This arrangement readily permits of the rod being lengthened or shortened, as may be required. The lower end of the pin b is bifurcated and straddles the arm C, as shown in Fig. 3 of the drawings. The upper en d of the sleeve is enlarged, thus providing the shoulder b, underneath which is coiledv the lower end of the rod C', the upper endof the same being connected to the inner end of the hand-lever C. By depressing the outer end of the handlever C2 the emery-wheel may be raised up from contact with the saw Without stopping the machine, the sleeve sliding up on its loose joint connecting with the graduated arm C.

The'upper end of the rod B5 is attached to the lug B7 projecting from the rear side of the emery-wheel gate B, as shown in Fig. 4, by which means the required up-'anddown movement is imparted to the emery-wheel gate. The emery-wh'eel gate is supported in the guide-frame B8, and has a slightly inclined movement, as 'shown in Fig. 1, whereby lthe emery-wheel is brought in contact with the teeth of the saw in such a manner as to impart a line, sharp point to the same. The required rotary `motion is imparted to the emery-wh'eel and arbor, on which the sameis mounted, by a belted connection with the band-pulley B, mounted at the back part 'of the machine, as shown in Fig. 4. A 1

One end of the rod D has a crank 'connection with the irregular cam B, which in this case performs the functions of a crank-wheel. The opposite end of this rod is connected to the lower end of the graduated arm D', the upper end of which is pivoted to a bracket projecting downward from the top of the frame-work, and is adapted to have a swinging movement. The arm D is provided with apertures corresponding i'n arrangement and number 'with similar apertures in the arm C. One end of the companion rod D is also connected to the arm D', and is adapted to be ad justed to as many dierent positions as there are holes in the arm. The opposite end of the rod D" is attached to the vertical lever D3 at a point near lits longitudinal center. y This lever is pivoted at the lower end to the framework, the upper end being adapted to move back and forth when the mechanism is in o'peration. -The upper end of this rocking lever is provided with the feed-finger B, which is adapted to have contact with the teeth of the saw, and feed the same forward to the e-merywheel in regular order of succession. This feedf1nger may be set so as to give the emery- Wheel-a light or heavy cut on the teeth by means of the right and left joint d on the rod D. l y

dz is a rest for the feed-linger, and is adjustable to dilferent positions by means of the elongated slot d3. This rest is for the purpose of adapting the feed-finger y to diIferent-spaced teeth, and the distance the same is 'to drop down between'the teeth.

The shifting of the rod D2 in the different holes in the arm D is for the purpose of adj nsting these parts in accordance with the distance the teeth are apart in the different saws. One-half the distance between the points of the teeth is equal to the depth of the same, so that the connection with the two graduated armsmay usually be arranged with reference to each other, in order to have a uniform operation.

E represents an eccentric clamping-lever pivoted to the under side of the top framepiece,.the head or end F being adapted to clamp the saw-plate just below the line of the teeth for the purpose of s'ti'ening and holding the saw in proper position relative to the emery-wheel during the operation of dressing the same. This lever is thrown into 'or released frorn a clamping position by means of the handle F. By moving this handle in one direction the end F is brought into contact with the saw-plate, and by moving the same in the opposite direction the clamping end is thrown away from the saw.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is p 1` l. The combination, with the irregularshaped cam-wheel B, of the lever B, pivoted at one end, the opposite end being adapted to rise and fall, the frictionroller a2, the rod B, `the graduated arm C, provided with a number of apertures arranged at regular intervals, and the adjustable connecting-rod B, whereby motion is transmitted to the emery-wheel and the shape and depth of the teeth determined, substantially as described.

2. In a saw-sharpening machine, the combination, with an emery-wheel, of a moving gate supporting said wheel, a guideframe, the loose sleeve b, having a loose joint at the lower end, and the shoulder b on the upper end, the rod C', and the hand-lever C2, whereby the emery-wheel may be raised from contact with the saw wit-hout stopping the machine, substantially as set forth.

3. The combination, with the cam B, adapted to perform the functions of a crank-wheel, 'of 'theconnecting-rod D, the graduated arm D', the adjustable companion rod D2, the vertical lever D3, and the feed-finger B2, whereby.

the required movement andadjnstment are given to said feed-finger, substantially as dcscribed v 4. rThe combination, with the feed-linger B?, of the adjustable rest d", provided with the elongated Vslot d, whereby said feed-linger may be adapted to conform to teeth of various shapes and depths, as set forth.

MILo oovEL.

Witnesses:

L. M FREEMAN, V. STANwooD.

ICO

IIO 

